Windows 10: Copy/move all nef files on drive to one single file

I should like to copy and/or mover (xcopy?) all my nef files on a given drive to a single file.
How ?
Win 10 Pro 64 Version 1909
Thank you,
JJV

:)

 

Java.nio.file - Copying files

You can't copy a folder, thats why it generates an exception (you are trying to copy a folder using a copy file function).
You probably need to list all the files inside that folder and copy one by one

 

Java.nio.file - Copying files

Issue was the above, so thanks temp02.

 

File copying speed questions

Quite easily USB flash storage pen drive speed can be influenced by type of HDD or SSD inside the machine (both the physical device itself, the controller they are connected to via motherboard in terms of hardware, firmware and drivers wise), the USB controller on the particular machine (which includes hardware, firmware and drivers) and lastly there is the performance of the USB pen drive itself.

Normally you would get good USB pen drive performance from machines with the latest hardware, updated with latest firmware and software, and when the machine is used with a new USB pen drive with good performance specifications.

As for speed fluctuations the first part of the process is often done with temporary burst speed and drops down to a sustained speed, and transfer speeds can vary with different types of files such as copying a single file (often fast), multiple files (normally take longer and can take longer than copying multiple files, which are collectively the same size, as a single file) or a compressed files with either a single or multiple files inside (normally faster than uncompressed files of the same set of files which were compress into the compressed archive file).